<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=">
  <title>slack loading animation</title>
</head>
<body>
  <div class="loading"></div>
</body>
</html>
body
{
  margin: 0;
  padding: 0;
  background-color: #f1f1f1;
}

.loading
{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(75deg);
  width: 15px;
  height: 15px;
}

.loading::before, .loading::after
{
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 15px;
  height: 15px;
  border-radius: 15px;
  animation: loading 1.5s infinite linear;
}

.loading::before
{
  box-shadow: 15px 15px #E01E5A, -15px -15px #2FB67C;
}

.loading::after
{
  box-shadow: 15px 15px #36C5F1, -15px -15px #EDB12D;
  transform: translate(-50%, -50%) rotate(90deg);
}

@keyframes loading
{
  50%
  {
    height: 45px;
  }
}
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